<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>hello</title>
		<style type="text/css">
			.onediv{
				width: 300px;
				height: 400px;
				background: red;
			}
		</style>
	</head>
	<body>
		<div class="onediv">
			世界你好
		</div>
	</body>
</html>
